by John Piper

Piper begins with 1 Corinthians 15:12-19 to show that if Christ has not been raised our preaching is in vain, our faith is futile, we remain in our sins, and we are of all people most to be pitied for the risky life we have chosen.
Piper explains that the joy Paul speaks of is the joy of hope in the resurrection, not a string of earthly successes, which is why he could freely choose risk, hardship, and self-denial for the sake of love instead of maximizing comfort.
Drawing from Colossians 1:24, Piper argues that in our own flesh we fill up what is lacking in Christ's afflictions by carrying them visibly and personally to people and peoples so they can see and receive what Christ accomplished.
Piper points to Matthew 5 to show that rejoicing in persecution for the sake of the coming reward reveals the reality of resurrection hope and becomes the tangy salt and bright light that the world cannot explain any other way.
This is the main text Piper reads to show that without resurrection our faith collapses and our costly obedience becomes foolish.
Piper quotes this to contrast the normal path of maximizing earthly pleasures with the resurrection-shaped choice to suffer.
Piper centers his argument here, showing that our sufferings transfer Christ's afflictions in a personal way to the church so they accomplish their designed work.
This verse supplies the analogy Piper uses to explain what filling up what is lacking means through Epaphroditus's risky service.
Piper appeals to these words to show that joy in suffering is what marks us as light to the world and testifies to resurrection hope.
Ask God this week to show you one concrete path of costly love toward a person or group who needs the gospel. Take one obedient step along that path while consciously hoping in the resurrection so your joy can point others to Christ.